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Lunar Reconnaissance Orbiter (LRO)



LRO entered Lunar Orbit at 6:27pm EDT, June 23, 2009. Read our update about the orbit insertion maneuvers of LRO and LCROSS

Read Ken Kremer's Interview with LCROSS Scienitst Kimberly Ennico

After several decades in which lunar missions have taken a back seat to the exploration of more distant worlds, the Moon is once again a prime destination for NASA missions. Under the guidelines of the Vision for Space Exploration, NASA is charged with establishing a permanent base on the Moon, where technologies aimed at taking humans to Mars can be tested. Creating such a habitat, however, requires close and detailed knowledge of the lunar environment, and NASA is working on a series of missions to learn more about conditions on Earth's giant satellite. Leading the charge is the Lunar Reconnaissance Orbiter (LRO), the first of NASA's Lunar Precursor and Robotic Program (LPRP) missions.

Launched on June 18, 2009, LRO will take 4 days to reach the Moon and spend the following two months adjusting its orbit. It will then settle on a near-circular path that will take it from pole to pole at a height of around 50 kilometers (30 miles) above the lunar surface. LRO is scheduled to remain in this polar orbit for at least a year, all the while collecting and recording data on lunar conditions.

As a first step towards establishing human presence on the Moon, LRO will focus on the factors that most affect the ability of humans to survive in hostile lunar conditions. The spacecraft's six instruments will enable it to precisely measure radiation levels near the Moon, monitor the extreme temperature fluctuations that characterize its surface, detect evidence of the presence of water ice, search for suitable landing sites, and more. The mass of scientific data that will be gathered by LRO will then serve to take humans one step closer to expanding our presence in the solar system.

Mission Facts
Launch Date: June 18, 2009
Launch Vehicle: Atlas 401
Mass: 1,000 kilograms, out of which about 100 kilograms is payload capacity
Orbit: polar, near-circular, about 50 kilometers (30 miles) above lunar surface